No criminal charges were laid against police.
His brother, Pierre Magloire, is hoping the inquiry leads to improvements in the way police and medical professionals deal with individuals who have mental illness.
"I don't have that much confidence that it's going to change everything, but maybe it (will lead) to one step forward," he told the CBC morning show Daybreak.
Magloire, 41, was the father of two girls and worked as a molecular biology researcher before developing a mental illness.
He began living on the streets in November 2013, just three months before his death, according to his brother.
Documents obtained by Radio-Canada last week showed Magloire sought help from medical services that same month, telling staff at Montreal's Sacré-Coeur Hospital that he wanted to kill someone and “wanted to talk to a social worker or psychologist.”
Magloire was released the next day.
Pierre Magloire said he was "sick to his stomach" when he learned that his brother had tried to get assistance. He said it shows that Alain slipped through the cracks of the system.
"He was willing to receive treatment," he said.
"It's like if you're going to the hospital with a broken arm and they say, 'oh no, just take a pill and go home.'"
The hearings are expected to last two weeks.